Quantifying electrical spin injection: Component-resolved electroluminescence from spin-polarized light-emitting diodes

Jonker, BT Hanbicki, AT Park, YD Itskos, G Furis, M Kioseoglou, G Petrou, A Wei, X

Bt. Jonker et al., Quantifying electrical spin injection: Component-resolved electroluminescence from spin-polarized light-emitting diodes, APPL PHYS L, 79(19), 2001, pp. 3098-3100

16

INGLESE

Article

Apllied Physucs/Condensed Matter/Materiales Science

APPLIED PHYSICS LETTERS

0003-6951 → ACNP

79

19

2001

3098 - 3100

ISI

0003-6951(20011105)79:19<3098:QESICE>2.0.ZU;2-E

The spin-polarized light-emitting diode (spin-LED) is a very effective tool for accurately quantifying electrical spin injection in a model independen t manner. We resolve and identify various components which occur in the ele ctroluminescence (EL) spectra of GaAs quantum-well-based spin-LEDs, and exa mine the circular polarization of each. While a number of components exhibi t significant circular polarization, the values do not necessarily reflect the electrical spin injection efficiency. We show that a reliable measure o f spin injection efficiency can be obtained only if one takes care to spect roscopically resolve and accurately identify the free exciton or free carri er components of the EL spectrum, and exclude other components. (C) 2001 Am erican Institute of Physics.